The Ohio Bureau of Employment gathered the following sample information on the number of hours unemployed workers spent looking for work last week.
Determine the mean.
Determine the variance and the standard deviation.
Hours spent Searching ______Number of Unemployed
0 up to 10....................................................3
10 up to 20...................................................7
20 up to 30.................................................15
30 up to 40.................................................10
40 up to 50..................................................5
TOTAL....................................................40